Re: i386/x86_64 segment register issuses (Re: PATCH: Fix x86 segment register access)

["H. J. Lu" <hjl@lucon.org>]

On Wed, Mar 30, 2005 at 11:23:25AM -0500, linux-os wrote:
> 
> So if there are any "movw (mem), %ds" and
> "movw %ds, (mem)" in the code. The sizeof(mem)
> needs to be 32-bits and the 'w' needs to be removed.
> Otherwise, we are wasting CPU cycles and/or fooling
> ourselves. GAS needs to continue to generate whatever
> it was fed, with appropriate diagnostics if it
> is fed the wrong stuff.

FYI, gas hasn't generated 0x66 on "movw (%eax),%ds" for a long time
and started doing it on "movw %ds,(%eax)" since Nov. 4, 2004.


H.J.
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